Commenting, notifications, and more threading
* Added/clarified comments throughout the three main classes.
* Added method descriptions throughout
* Added a sticky notification icon that shows up whenever the background
  service is running (this will probably be something to show up in
  preferences once they are created)
* Eliminated the use of timers with the threads by using a handler post loop
* Created a query to search for an existing iResponsible data folder
  (previously created a new folder every time)